diff --git a/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp b/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp
index 0070f932ac24a..1c0a6116aa0da 100644
--- a/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp
+++ b/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp
@@ -9284,16 +9284,17 @@ bool SwiftASTContext::GetCompileUnitImportsImpl(
       validate_pcm = true;
 #endif
     }
-    
-    auto &pp_opts = m_clangimporter->getClangPreprocessor()
-      .getPreprocessorOpts();
-    pp_opts.DisablePCHOrModuleValidation =
-        validate_pcm ? clang::DisableValidationForModuleKind::None
-                     : clang::DisableValidationForModuleKind::All;
-    pp_opts.ModulesCheckRelocated = validate_pcm;
-
-    LOG_PRINTF(GetLog(LLDBLog::Types), "PCM validation is %s",
-               validate_pcm ? "disabled" : "enabled");
+
+    const auto &pp_opts =
+        m_clangimporter->getClangPreprocessor().getPreprocessorOpts();
+    // rdar://155232969
+    // pp_opts.DisablePCHOrModuleValidation =
+    //     validate_pcm ? clang::DisableValidationForModuleKind::None
+    //                  : clang::DisableValidationForModuleKind::All;
+    // pp_opts.ModulesCheckRelocated = validate_pcm;
+
+    if (!validate_pcm)
+      LOG_PRINTF(GetLog(LLDBLog::Types), "PCM validation cannot be disabled");
   }
   
   LOG_PRINTF(GetLog(LLDBLog::Types), "Importing dependencies of current CU");
diff --git a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp b/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp
index 8ace6bc09d4d6..916b75bd8ca44 100644
--- a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp
+++ b/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp
@@ -16,6 +16,7 @@
 #include "Plugins/LanguageRuntime/Swift/SwiftLanguageRuntime.h"
 #include "lldb/Core/PluginManager.h"
 #include "lldb/Symbol/CompileUnit.h"
+#include "llvm/Support/Error.h"
 #include <lldb/lldb-enumerations.h>
 #include <llvm/ADT/StringRef.h>
 
@@ -207,6 +208,13 @@ bool TypeSystemSwift::GetPtrAuthAddressDiversity(
   return false;
 }
 
+llvm::Expected<CompilerType> TypeSystemSwift::GetDereferencedType(
+    lldb::opaque_compiler_type_t type, ExecutionContext *exe_ctx,
+    std::string &deref_name, uint32_t &deref_byte_size,
+    int32_t &deref_byte_offset, ValueObject *valobj, uint64_t &language_flags) {
+  return llvm::createStringError("Swift types cannot be dereferenced");
+}
+
 namespace llvm {
 llvm::raw_ostream &
 operator<<(llvm::raw_ostream &os,
diff --git a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h b/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h
index d389fba4e8c86..75d04a6d3db6d 100644
--- a/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h
+++ b/lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h
@@ -350,6 +350,12 @@ class TypeSystemSwift : public TypeSystem {
   unsigned GetPtrAuthDiscriminator(lldb::opaque_compiler_type_t type) override;
   bool GetPtrAuthAddressDiversity(lldb::opaque_compiler_type_t type) override;
 
+  llvm::Expected<CompilerType>
+  GetDereferencedType(lldb::opaque_compiler_type_t type,
+                      ExecutionContext *exe_ctx, std::string &deref_name,
+                      uint32_t &deref_byte_size, int32_t &deref_byte_offset,
+                      ValueObject *valobj, uint64_t &language_flags) override;
+
   /// \}
 protected:
   /// Used in the logs.